First things first. My "reviews" system is explained on a blog entry. Which can be found through my profile.
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✦Story
Story is hard to summarize. But in a nutshell it's episodic problem solving related to spiritual/mythological things for the most parts. With inter-webbing main characters development, story and an absolute cluster of CLAMPs multiverse.

Other than that, xxxHolic is extremely emphasized on people, bonds, emotions and heart of a living beings. Which is the same thing I absolutely adored in "Tsubasa Chronicles" and they are quite connected to holic in CLAMPverse. Ayhow, there are plenty of heart tugging episodes and moments with immense amount of bittersweet emotions and sense of tragedy and pain to in.

Nevertheless I found the story dialogues very pleasant, sad and important. In a sense fairly philosophical as well. At the first I didn't want to give it full mark, as some elements felt loose-ended and ending was a bit disappointing.

I feel that I shouldn't mention more about story. As it's type of story that reader will either hate or love/relate/intertwine... And I personally, adored it.

✦Art
CLAMP. Meaning Art is good and unique. Blissful amount of great Kimonos. Blissful effects and emphasis on creatures and the world. It's a bit dated, so characters feel a bit "off". And I don't mean by that the CLAMP style of drawing stretched and thin characters. I mean mostly some pages and facial expressions "quality" being rather "derp".

✦Characters
I love Yuuko. Mature, beautiful, kind, strict, mysterious with absolutely adorable childish side.

All the other main characters are as well splendid, unique, odd and every character in this Manga has it's side of darkness and bittersweetness.

Lot of adorable and characters to care about, including side characters. Even if they show up only once.

✦Enjoyable & Overall
Get's my TOPFAV tag. It ain't as "perfect" I wanted it to be. But in the end, it's an absolute bliss of sweetness and sadness.

CLAMP has amazing stories. And "Tsubasa Chronicles" and "xxxHolic" are in the TOP for me. Both intertwine, connect and are beautiful and pleasure to read/watch.